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US5650010A - Apparatus for two-side coating of a thin printing paper web containing mechanical pulp or recycled fiber - Google Patents

Apparatus for two-side coating of a thin printing paper web containing mechanical pulp or recycled fiber Download PDF

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Publication number
US5650010A
US5650010A US08/573,570 US57357095A US5650010A US 5650010 A US5650010 A US 5650010A US 57357095 A US57357095 A US 57357095A US 5650010 A US5650010 A US 5650010A
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US
United States
Prior art keywords
coating
web
roll
film
rolls
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US08/573,570
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English (en)
Inventor
Rauno Rantanen
Kai Vikman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Valmet Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FI924960A external-priority patent/FI94883C/fi
Application filed by Valmet Oy filed Critical Valmet Oy
Priority to US08/573,570 priority Critical patent/US5650010A/en
Assigned to VALMET CORPORATION reassignment VALMET CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: VALMET PAPER MACHINERY, INC.
Priority to US08/820,446 priority patent/US6190729B1/en
Application granted granted Critical
Publication of US5650010A publication Critical patent/US5650010A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0813—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for supplying liquid or other fluent material to the roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/08—Mechanical or thermomechanical pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres

Definitions

  • the present invention relates to a method for two-side coating of a thin printing paper web containing mechanical pulp, e.g., a paper web made of recycled fiber.
  • the invention further relates to an apparatus suited to two-side coating of a thin printing paper web made of mechanical pulp.
  • Thin printing paper webs containing mechanical pulp are conventionally coated on subsequent coating stations equipped with short-dwell coaters as the coater units.
  • a combination of two subsequent coater stations is necessary as low base paper weight and high content of ground wood make single-run coating on both sides impossible.
  • Two-side coating with conventional methods would excessively wet the web and thus impair its runnability. Furthermore, the measurement of coat weight in a two-side coating operation is difficult.
  • short-dwell coaters also have several drawbacks. Air entrapped in the coat paste easily causes mottling. Because of the small linear application pressure and short application distance, wetting of the base web and subsequent fiber swelling occurs even after the web has passed the doctor blade, thereby impairing the smoothness of the coat being applied. As a rule, doctor blade coating methods become critical with thin webs and particularly with light coat weights.
  • Paper grades containing a high proportion of mechanical pulp and a high percentage of coat fillers such as, e.g., SC paper (wood containing high filler content super-calendared printing paper) make doctor blade coating impossible because of the fragility of the base paper web.
  • SC paper wood containing high filler content super-calendared printing paper
  • Base paper grades containing recycled fiber have posed unexpected problems in doctor blade coaters, specifically, the coat is easily marked during coating by streaks caused by defective doctor blades.
  • the darker color of recycled-fiber containing base paper grades make the opacifying power of the coat mix more critical. Because of the way in which doctor blade coating is accomplished, a smooth coat is formed, not a coat of uniform coat weight. As the base paper is not necessarily smooth, the opacifying power obtained in doctor blade coating is insufficient, resulting in mottling of the coated web.
  • the present invention is based on performing the coating operation using a two-step compressive film-lamination technique.
  • the present invention relates a method and apparatus in which a coating is applied onto both sides of a light base weight printing paper web containing mechanical pulp or recycled fiber in which one side of the web is coated in a first coating station and then dried, at least partially, in a first dryer unit, and then the second side of the web is coated in a second coating station and then dried, at least partially, in a second dryer unit.
  • Both of the two coating layers are formed by applying the required amount of a coating mix onto the perimeter of respective soft film-coating rolls which rotate with a peripheral speed approximately equally to the speed of the paper web.
  • the coating mix is subsequently transferred to the paper web in a nip formed between a respective backing roll and the respective soft film-coating rolls.
  • the invention provides significant benefits.
  • the present invention cuts in half the amount that a web is wetted in comparison to single-run two-side coating.
  • the present invention provides good runnability.
  • good coat quality is attained at light coat weights.
  • Particular benefit is achieved with base paper grades containing recycled fibers because the formation of streaks associated with doctor blade coating can be avoided.
  • the compressive film-lamination technique forms a coat of uniform weight on the web, the coat has high opacifying power. For the same reason, a higher burst index relative to doctor blade coating is attained.
  • the measurement of coat weight by means of rupturing testers is easy.
  • the present invention imposes minimal mechanical stress on the web.
  • the uncoated side can be supported by a roll immediately after the coating of the other side, thus achieving a significant reduction in coat unit size.
  • FIG. 1 is a side elevation view of a part of a paper machine incorporating a coater according to the present invention
  • FIG. 2 is a side view of an alternative embodiment of the coating step of the present invention.
  • FIG. 3 is a side view of a detail of a nozzle assembly according to the present invention.
  • the term light web material refers to web materials having a base weight of less than 65 g/m 2 .
  • the apparatus comprises two compressive film-lamination stations: a first coating station 1 and a second coating station 2.
  • a first drying unit 3 is placed between the two coating stations.
  • the path of web 5 is configured so that subsequent to the first drying unit 3 there is the second coating station 2, followed by a second drying unit 4.
  • both drying units have a similar construction.
  • the first coating station 1 is comprised of a film-coating roll 22, a coater bar 20 and a backing roll 24 of the film coating roll 22.
  • the coater bar 20 meters a desired amount of coating mix onto the film-coating roll 22, wherefrom the coating mix is subsequently transferred in the nip N 1 to the web 5.
  • the backing roll 24 has advantageously a smaller diameter than the film-coating roll, whereby the angle at which the web 5 conforming to the backing roll 24 exits the nip N 1 is maximized.
  • the web 5 is guided toward the film-coating roll 22, whereby also a good coat surface quality is obtained.
  • the first drying unit 3 is comprised of infra-red dryers 6 and dryer drums 7.
  • the coating bar 20 can be replaced by a so-called gate roll coater in which the coating mix is transferred from a coating mix fountain 34 located above a nip N 2 , which is formed by a transfer roll 30 and a metering roll 32, via the nip N 2 onto the perimeter of said metering roll 32 and further via a nip N 3 onto the perimeter of a film-coating roll 36.
  • a coating mix fountain 34 located above a nip N 2 , which is formed by a transfer roll 30 and a metering roll 32, via the nip N 2 onto the perimeter of said metering roll 32 and further via a nip N 3 onto the perimeter of a film-coating roll 36.
  • the coating mix is applied to a web 38 in a nip N 4 formed between the film-coating roll 36 and a backing roll 39.
  • the diameter of the backing roll 39 can be smaller than the diameter of the film-coating roll 36.
  • the film-coating roll 36 has a diameter of 1000 mm and the backing roll 39 has a diameter of 800 mm.
  • the surface of the film-coating roll 22, 36 is adjusted to carry a film of the coating mix of approximately 7 to 15 ⁇ m in thickness, a major portion (typically approximately 80%) of which is adhered to the web in the nip between the film-coating roll and the backing roll.
  • the web is coated with a coat of 7 to 15 g/m 2 dry weight.
  • the adsorption of the coating mix paste and the water contained therein is related to the magnitude of the nip pressure and the duration of said pressure, that is, the width of the nip.
  • the nip width is solely determined by the diameters of the rolls and their hardness, while the magnitude of the nip pressure is principally determined by the linear loading of the nip, and additionally, by the web speed. Accordingly, good penetration of the coat into the web is achieved by means of a high linear application pressure imposed in a relatively wide nip.
  • the maximum nip pressure typically is 1000 kPa gauge and the nip width is in excess of 15 mm. Good results according to the present invention have been obtained by keeping the nip pressure above 500 kPa and the nip width greater than 10 min. Such desirable nip widths can be attained by means of hard rolls with diameters in excess of 600 mm. Particularly the film-coating roll must have a diameter greater than 600 mm, whereby the backing roll must also have a diameter in excess of 600 mm. To achieve the minimum pressure limit of 500 kPa, the linear nip loading must be at least 20 kN/m for typical coating mix paste.
  • the application pressure is only approximately 50 to 100 kPa, while a conventional doctor blade coater can achieve a pressure of 1000 kPa over a nip width of less than 1 mm. In a conventional short-dwell coater the encountered levels of application pressure are even lower.
  • the technique according to the invention is typically suitable for web speeds of 400 to 1500 m/min.
  • the linear nip loading is typically in the range of 20 to 50 kN/m, advantageously approximately 35 kN/m.
  • the coating material of both the backing roll 39 and the film-coating roll 36 is polyurethane, rubber or any suitable resilient material.
  • the P & J numbers of the rolls are typically in the range of approximately 0 to 40.
  • the film-coating roll employed in the embodiments according to the invention is invariably a so-called soft roll with a surface material of polyurethane, for instance.
  • the backing roll has a metal surface.
  • the metal surface can be of chromium, for instance.
  • ceramic or polymer covered backing rolls are usable.
  • a metal or ceramic covered backing roll performs initial calendaring of the coated web.
  • Such coated rolls with a steel core can also be chilled, whereby condensation of moisture on to the roll perimeter is attained, which in turn aids keeping the roll clean.
  • steam cleaning means and scraper blades shown schematically in FIG. 1 with a common reference numeral 30, can also be used for keeping the rolls clean.
  • the nozzle assembly employed for metering the coating mix onto the film-coating roll can also be a slot-orifice die metering assembly or a spraying apparatus capable of spraying the coating mix onto the roll surface.

Landscapes

  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
US08/573,570 1992-11-03 1995-12-15 Apparatus for two-side coating of a thin printing paper web containing mechanical pulp or recycled fiber Expired - Lifetime US5650010A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US08/573,570 US5650010A (en) 1992-11-03 1995-12-15 Apparatus for two-side coating of a thin printing paper web containing mechanical pulp or recycled fiber
US08/820,446 US6190729B1 (en) 1992-11-03 1997-03-12 Method for two-side coating of a thin printing paper web containing mechanical pulp or recycled fiber

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI924960A FI94883C (fi) 1992-11-03 1992-11-03 Menetelmä ja laitteisto mekaanista massaa sisältävän ohuen painopaperirainan kaksipuoliseksi päällystämiseksi
FI924960 1992-11-03
US13203793A 1993-10-05 1993-10-05
US08/573,570 US5650010A (en) 1992-11-03 1995-12-15 Apparatus for two-side coating of a thin printing paper web containing mechanical pulp or recycled fiber

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US13203793A Continuation 1992-11-03 1993-10-05

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US08/820,446 Division US6190729B1 (en) 1992-11-03 1997-03-12 Method for two-side coating of a thin printing paper web containing mechanical pulp or recycled fiber

Publications (1)

Publication Number Publication Date
US5650010A true US5650010A (en) 1997-07-22

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Family Applications (2)

Application Number Title Priority Date Filing Date
US08/573,570 Expired - Lifetime US5650010A (en) 1992-11-03 1995-12-15 Apparatus for two-side coating of a thin printing paper web containing mechanical pulp or recycled fiber
US08/820,446 Expired - Fee Related US6190729B1 (en) 1992-11-03 1997-03-12 Method for two-side coating of a thin printing paper web containing mechanical pulp or recycled fiber

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Application Number Title Priority Date Filing Date
US08/820,446 Expired - Fee Related US6190729B1 (en) 1992-11-03 1997-03-12 Method for two-side coating of a thin printing paper web containing mechanical pulp or recycled fiber

Country Status (5)

Country Link
US (2) US5650010A (fr)
EP (1) EP0596365B1 (fr)
JP (1) JP3188795B2 (fr)
AT (1) ATE176508T1 (fr)
DE (1) DE69323388T2 (fr)

Cited By (10)

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Publication number Priority date Publication date Assignee Title
DE19743246A1 (de) * 1997-09-30 1999-04-01 Voith Sulzer Papiertech Patent Kombinations-Auftragsvorrichtung
US6413371B1 (en) 1998-06-10 2002-07-02 Metso Paper, Inc. Method for manufacture of paper and a paper machine
US6464163B1 (en) 1997-12-04 2002-10-15 Metso Paper, Inc. Method and device in a paper machine, coating machine, intermediate winder, unwind stand of a slitter-winder, or in any other device for treatment of a web
US20030019424A1 (en) * 2001-07-19 2003-01-30 Canon Kabushiki Kaisha Coating liquid application apparatus, image printing apparatus and coating liquid application method
US20030049379A1 (en) * 2001-08-17 2003-03-13 Fuji Photo Film Co., Ltd. Coating method and coating apparatus
US20040069219A1 (en) * 1999-06-18 2004-04-15 Martin Kustermann Roller provided for use in coating machines
EP1845192A1 (fr) * 2006-04-10 2007-10-17 Voith Patent GmbH Coucheuse
US20110183065A1 (en) * 2010-01-28 2011-07-28 Bill Schlegel Methods and apparatus for roll-coating sheet articles using metering roll of variable profile
WO2019036385A1 (fr) * 2017-08-16 2019-02-21 Midwest Recycled & Coated Containerboard Mill, LLC Stratification et couchage en ligne d'un substrat à base de cellulose
CN114899477A (zh) * 2022-06-27 2022-08-12 广州小鹏汽车科技有限公司 电芯以及锂离子电池

Families Citing this family (8)

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FI96338C (fi) * 1994-04-19 1996-06-10 Valmet Corp Menetelmä ja laitteisto painopaperirainan kaksipuoliseksi päällystämiseksi
DE4414949A1 (de) * 1994-04-28 1995-11-02 Voith Gmbh J M Vorrichtung zum Auftragen von mindestens einem flüssigen Medium auf eine laufende Materialbahn
DE4420242A1 (de) * 1994-06-10 1995-01-05 Voith Gmbh J M Einrichtung zur wahlweisen Behandlung einer laufenden Bahn
DE29511089U1 (de) * 1995-07-08 1995-10-19 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Vorrichtung zum Herstellen einer gestrichenen Materialbahn
FI109216B (fi) 1996-03-06 2002-06-14 Metso Paper Inc Menetelmä ja sovitelma liikkuvan radan päällystämiseksi
FI104196B (fi) * 1998-03-03 1999-11-30 Valmet Corp Menetelmä ja sovitelma liikkuvuuden paperi- tai kartonkiradan päällystämiseksi
FI121968B (fi) * 2000-02-15 2011-06-30 Metso Paper Inc Laitteisto paperin tai kartongin käyristymisen hallitsemiseksi
DE10228114A1 (de) * 2002-06-24 2004-01-15 Voith Paper Patent Gmbh Vorrichtung zum beidseitigen Streichen und zum Trocknen einer Materialbahn, insbesondere aus Papier oder Karton

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US7211151B2 (en) 2001-07-19 2007-05-01 Canon Kabushiki Kaisha Coating liquid application apparatus, image printing apparatus and coating liquid application method
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US20050214473A1 (en) * 2001-07-19 2005-09-29 Canon Kabushiki Kaisha Coating liquid application apparatus, image printing apparatus and coating liquid application method
US6960259B2 (en) * 2001-07-19 2005-11-01 Canon Kabushiki Kaisha Coating liquid application apparatus, image printing apparatus and coating liquid application method
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WO2019036385A1 (fr) * 2017-08-16 2019-02-21 Midwest Recycled & Coated Containerboard Mill, LLC Stratification et couchage en ligne d'un substrat à base de cellulose
CN114899477A (zh) * 2022-06-27 2022-08-12 广州小鹏汽车科技有限公司 电芯以及锂离子电池

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EP0596365B1 (fr) 1999-02-03
US6190729B1 (en) 2001-02-20
JPH073695A (ja) 1995-01-06
DE69323388D1 (de) 1999-03-18
DE69323388T2 (de) 1999-06-10

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